Kathleen Robertson
Television

Year
Title
Role
Notes
1986
The Campbells
Dorothea Spencer
Episode: "A Man of Means"
1988
My Secret Identity
Jennifer
Episode: "Grounded"
1990
C.B.C.'s Magic Hour
Cynthia Bundy
Episode: "The Prom"
1990–1993
Maniac Mansion
Tina Edison
Series regular, 65 episodes Nominated — Young Artist Award for Best Young Actress Co-starring in an Off-Primetime or Cable Series (1991–92)
1993
The Hidden Room
Anne Morrison
Episode: "Passages"
1994
Heaven Help Us
-
Episode: "Upstairs, Upstairs"
1994–1997
Beverly Hills, 90210
Clare Arnold
Series regular, 99 episodes
1995
Burke's Law
Tracy Bird
Episode: "Who Killed the World's Greatest Chef?"
2002
Girls Club
Jeannie Falls
Series regular, 9 episodes
2005
Law & Order: Criminal Intent
Darla Pearson
Episode: "View from Up Here"
2006
Medium
Diana Marvin / Kathy
Episode: "Ghost in the Machine"
2006–2007
The Business
Julia Sullivan
Series regular, 12 episodes Nominated — Gemini Award for Best Ensemble Performance in a Comedy Series (2007)
2007
Tin Man
Azkadellia
TV miniseries
2009
Flashpoint
Helen Mitchell
Episode: "Custody"
2010
CSI: Miami
Kayla Pennington
Episode: "Meltdown"
2011
Rookie Blue
Leslie Atkins
Episode: "Best Laid Plans"
2011–2012
Boss
Kitty O'Neill
Series regular, 18 episodes
2013
Cracked
Erin
Episode: "White Knight"
2014
Bates Motel
Jodi Morgan
Recurring role, 5 episodes
2014–2016
Murder in the First
Hildy Mulligan
Series regular, 32 episodes Nominated – Golden Maple Award for Best Actress in a TV series broadcast in the U.S. (2015)
2015
The Fixer
Ellie
TV miniseries
2019
Northern Rescue
Charlie Anders
main role

Question: What were Kathleen Roberton's two longest television roles?
Answer: Kathleen Robertson's two longest roles were as Tina Edison in Maniac Mansion (1990–1993) and as Clare Arnold in Beverly Hills, 90210 (1994–1997), which she appeared in for 65 and 99 episodes, respectively.